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Restricted Novel Heat Treatments for Obtaining High Jc in Nb- 46.5 WT.%Ti: II. Prestrain Dependence

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Advances in Cryogenic Engineering Materials

Part of the book series: An International Cryogenic Materials Conference Publication ((ACRE,volume 40))

Abstract

In an earlier study, minimal initial heat treatments (3hr/300C) after a large cold work drawing strain (εp=6.37 and 7) were found to be very successful in providing nucleation sites for triple-point α-Ti precipitation during a final full heat treatment (80hr/420C). The minimal heat treatment schedules were repeated and expanded upon in this study but with a cold work pre-strain of only 5. The lower pre-strain reduced the effectiveness of the minimal heat treatment schedules resulting, typically, in a 25% reduction in precipitate volume and in Jc. The Jc and volume % α-Ti values, however, remained remarkably high considering the minimal level of heat treatment and over 2800Amm −2 was achieved at 5T, 4.2K with only one conventional heat treatment (160hr/420C).

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References

  1. P. J. Lee, J. C. McKinnell, and D. C. Larbalestier, Restricted Novel Heat Treatments for Obtaining High Jc in Nb-46.5wt%Ti, Adv. Cryo. Eng., 36: 287 (1990).

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Author information

Author notes

  1. David C. Larbalestier

    Present address: Departments of Materials Science and Engineering and of Physics, USA

  2. James C. McKinnell

    Present address: Teledyne Wah Chang Albany, Albany, OR, USA

Authors and Affiliations

  1. Applied Superconductivity Center, University of WI-Madison, Madison, WI, 53706-1687, USA

    Peter J. Lee, James C. McKinnell & David C. Larbalestier

Authors
  1. Peter J. Lee
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  2. James C. McKinnell
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  3. David C. Larbalestier
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Editor information

Editors and Affiliations

  1. Cryogenic Materials, Inc., Boulder, Colorado, USA

    Richard P. Reed

  2. U.S. Department of Commerce, National Institute of Standards and Technology, Boulder, Colorado, USA

    Fred R. Fickett

  3. National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida, USA

    Leonard T. Summers

  4. MS Publications, Boulder, Colorado, USA

    M. Stieg

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© 1994 Springer Science+Business Media New York

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Lee, P.J., McKinnell, J.C., Larbalestier, D.C. (1994). Restricted Novel Heat Treatments for Obtaining High Jc in Nb- 46.5 WT.%Ti: II. Prestrain Dependence. In: Reed, R.P., Fickett, F.R., Summers, L.T., Stieg, M. (eds) Advances in Cryogenic Engineering Materials . An International Cryogenic Materials Conference Publication, vol 40. Springer, Boston, MA. https://doi.org/10.1007/978-1-4757-9053-5_92

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  • DOI: https://doi.org/10.1007/978-1-4757-9053-5_92

  • Publisher Name: Springer, Boston, MA

  • Print ISBN: 978-1-4757-9055-9

  • Online ISBN: 978-1-4757-9053-5

  • eBook Packages: Springer Book Archive

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